Renesas AT25XE512C-SSHN-T

Overview

AT25XE512C-SSHN-T from Adesto Technologies is a 512-Kbit serial flash memory IC with SPI interface, supporting Dual-Output Read at up to 50 MHz, 1.65V–3.6V single-supply operation, and granular erase architecture (256-byte page / 4-KB & 32-KB blocks). It delivers 6 ns clock-to-output timing and integrates a 128-byte OTP security register for device serialization in IoT edge nodes.

For engineers reviewing the AT25XE512C-SSHN-T datasheet, AT25XE512C-SSHN-T pinout, AT25XE512C-SSHN-T application, or AT25XE512C-SSHN-T equivalent, key selection criteria include ultra-low power deep power-down current (200 nA), JEDEC-standard ID read capability, hardware write protection via WP pin, and support for SPI Modes 0 and 3 in industrial temperature range (−40°C to +85°C).

Technical Context

The AT25XE512C-SSHN-T implements a dedicated SPI master-slave interface with four signal lines (CS, SCK, SI/I/O0, SO/I/O1), enabling Dual-Output Read where both SI and SO function as data outputs during 3Bh-command transfers. Its internal address counter auto-increments on each clock cycle during sequential reads.

Erase operations are fully hardware-managed with three granularity levels-page (256 B), block (4 KB or 32 KB), and full chip-and supported by automatic program/erase failure detection via the EPE bit in the Status Register. The OTP security register contains 64 bytes factory-programmed with a unique identifier and 64 bytes user-programmable.

Key Specifications

Pinout & Package

AT25XE512C-SSHN-T uses an 8-lead SOIC (150-mil) package with standard SPI pinout and hardware control pins for write protection and communication hold.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial flash memory applications.

Compared with W25Q40EW and MT25QL01G, the AT25XE512C-SSHN-T uniquely balances ultra-low power (200 nA), fine-grained erase (256-byte page), and Dual-Output Read - making it optimal for compact, battery-operated IoT endpoints where firmware agility and energy efficiency are co-primary constraints.

Availability

AT25XE512C-SSHN-T is available at Aetrix Electronics and suitable for smart sensor nodes, firmware-updateable wearables, industrial PLC I/O modules, and connected home gateways requiring stable component supply across extended product lifecycles.

Supply support for AT25XE512C-SSHN-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Adesto Technologies (now part of Dialog Semiconductor, Renesas Electronics) specialized in ultra-low-power nonvolatile memory and IoT connectivity solutions before acquisition in 2020.

The AT25XE512C-SSHN-T belongs to Adesto's EcoXi™ family of serial flash devices engineered specifically for energy-constrained, always-on IoT endpoints requiring secure, reliable, and field-upgradable firmware storage.

FAQ

What is the operating voltage range of the AT25XE512C-SSHN-T?

The AT25XE512C-SSHN-T operates from 1.65 V to 3.6 V on a single supply rail. This wide range supports direct interfacing with 1.8 V and 3.3 V MCUs without level shifting, and enables use in battery-powered systems where voltage drops over time - such as coin-cell or Li-ion applications - while maintaining full functionality including Dual-Output Read and OTP programming.

Does the AT25XE512C-SSHN-T support Quad SPI or only standard SPI?

The AT25XE512C-SSHN-T supports only standard SPI and Dual-Output Read (2-line output), not Quad SPI. It implements SPI Modes 0 and 3 with SI and SO as primary I/O lines, and repurposes SI as I/O0 during Dual-Output Read (3Bh command). No Quad SPI opcodes (e.g., 6Bh, EBh) or associated pins (IO2/IO3) are defined in the AT25XE512C-SSHN-T datasheet or pinout.

How does the hardware write protection (WP pin) function on the AT25XE512C-SSHN-T?

The WP pin on the AT25XE512C-SSHN-T is a low-active input that enables hardware locking of protected memory sectors. When held low, it prevents execution of Write Enable, Program, and Erase commands on protected regions - independent of software status register settings. The pin is internally pulled high, so it may float if unused, but external connection to VCC is recommended to prevent unintended protection activation from noise.

What is the purpose and structure of the OTP security register in the AT25XE512C-SSHN-T?

The AT25XE512C-SSHN-T includes a 128-byte One-Time Programmable (OTP) security register: 64 bytes are factory-programmed with a unique device identifier (used for secure boot binding or anti-cloning), and 64 bytes are user-programmable once for keys, calibration data, or ESN storage. Programming is irreversible and requires the 9Bh command; reading uses 77h. This eliminates need for external secure elements in cost-sensitive IoT designs.

Can the AT25XE512C-SSHN-T perform true simultaneous dual-bit reads, and what is the maximum achievable throughput?

Yes - during Dual-Output Read (3Bh command), the AT25XE512C-SSHN-T outputs two bits per SCK cycle: bit[7] on SO and bit[6] on SI (I/O0) simultaneously on the first falling edge, then bits[5:4], [3:2], and [1:0] across subsequent edges - delivering one full byte every four clocks. At its rated 50 MHz Dual-Output Read clock, this yields 12.5 MB/s effective throughput, double that of standard SPI at same frequency.